Patents by Inventor Tomoko Aono

Tomoko Aono has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220368944
    Abstract: The amount of memory required for CCLM prediction is reduced. The CCLM prediction parameter derivation unit (310442) derives a scale shift value corresponding to a luma difference value, and derives a CCLM prediction parameter, by shifting, by using the scale shift value, a value obtained by multiplying a value of a table referred to with a value obtained by performing right shift of the luma difference value by the scale shift value as an index and a chroma difference value. In addition, in a case of deriving a prediction image, a bit width is reduced by adaptively deriving a shift amount of a linear prediction parameter from the chroma difference value.
    Type: Application
    Filed: July 19, 2022
    Publication date: November 17, 2022
    Inventors: Yukinobu YASUGI, Eiichi SASAKI, Tomohiro IKAI, Tomoko AONO
  • Patent number: 11503319
    Abstract: In a case that luminance information is used for a chrominance prediction in a separate coding tree structure, there is a problem that chrominance blocks cannot be decoded before all luminance blocks constituting a tree are decoded. An image decoding apparatus that splits an image into coding tree units (CTUs) that are rectangular for processing includes a CT information decoding unit configured to split a CTU of the CTUs into coding trees CTs and to process one or more color components as a single coding tree using one coding tree CT of the coding trees CTs or process two or more color components as a separate coding tree using two or more coding trees CTs of the coding trees CTs depending on a tree mode, a CU decoding unit configured to decode a split flag indicating whether to further split a CT of the CTs and to recursively perform block splitting, and an intra predictor configured to use a decoded image of one color component to generate a prediction image of another color component.
    Type: Grant
    Filed: September 10, 2021
    Date of Patent: November 15, 2022
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomohiro Ikai, Tomoko Aono
  • Publication number: 20220345734
    Abstract: An image decoding apparatus is implemented that can suppress a decrease in coding efficiency in a case that a high compression rate is achieved. The image decoding apparatus includes a parameter decoder, and the parameter decoder decodes a skip flag indicating whether a skip mode is applied, and in a case that the skip flag does not indicate the skip mode, decodes a merge flag indicating whether a merge mode is applied, and in a case that the merge flag does not indicate the merge mode, decodes an MMVD flag indicating whether an MMVD mode is applied.
    Type: Application
    Filed: July 7, 2022
    Publication date: October 27, 2022
    Inventors: Takeshi CHUJOH, Eiichi SASAKI, Tomonori HASHIMOTO, Tomoko AONO, Tomohiro IKAI
  • Patent number: 11463701
    Abstract: A prediction image generation method is provided. The method derives a down-sampled luminance image and a down-sampled neighboring luminance image by down-sampling the luminance image of a target block and a neighboring luminance image based on information related to a down-sampling and indicating one of a plurality of position relationships between at least one luma pixel and a chroma pixel. The method derives a neighboring chrominance image, parameters derived from the down-sampled neighboring luminance image and the neighboring chrominance image, and the prediction image by using the down-sampled luminance image and the parameters. The position relationships include that a position of the chroma pixel is identical to a position of one of the at least one luma pixel and that the position of the chroma pixel is located in an intermediate of two of the at least one luma pixel on a left side of a 2×2 luma pixel block.
    Type: Grant
    Filed: May 20, 2021
    Date of Patent: October 4, 2022
    Assignees: SHARP KABUSHIKI KAISHA, FG Innovation Company Limited
    Inventors: Tomoko Aono, Tomohiro Ikai, Takeshi Chujoh
  • Patent number: 11451825
    Abstract: The amount of memory required for CCLM prediction is reduced. The CCLM prediction parameter derivation unit (310442) derives a scale shift value corresponding to a luma difference value, and derives a CCLM prediction parameter, by shifting, by using the scale shift value, a value obtained by multiplying a value of a table referred to with a value obtained by performing right shift of the luma difference value by the scale shift value as an index and a chroma difference value. In addition, in a case of deriving a prediction image, a bit width is reduced by adaptively deriving a shift amount of a linear prediction parameter from the chroma difference value.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: September 20, 2022
    Assignees: SHARP KABUSHIKI KAISHA, FG INNOVATION COMPANY LIMITED
    Inventors: Yukinobu Yasugi, Eiichi Sasaki, Tomohiro Ikai, Tomoko Aono
  • Publication number: 20220295091
    Abstract: In the related art, in some cases the weighted prediction processing is performed even in a case that normal prediction processing is to be performed. A video decoding apparatus includes a weighted prediction processing unit configured to decode a weight coefficient and an offset value from coded data and to generate a prediction image by multiplying an interpolation image by the weight coefficient and adding the offset value to the interpolation image, and a normal prediction processing unit configured to generate a prediction image from the interpolation image. In a case that in the weighted prediction processing unit, a bi-prediction is performed and information of the weight coefficient and the offset value is absent for both a reference list 0 and a reference list 1, the normal prediction processing unit generates a bi-prediction image.
    Type: Application
    Filed: November 26, 2020
    Publication date: September 15, 2022
    Inventors: Takeshi CHUJOH, Tomohiro IKAI, Tomoko AONO, Eiichi SASAKI, Tomonori HASHIMOTO
  • Patent number: 11431972
    Abstract: An image coding apparatus includes a coded data generating unit configured to generate coded data including image data for a subpicture acquired by dividing a picture, where the coded data generating unit generates, on a per subpicture basis, a subpicture header including subpicture identification information used for identifying the subpicture, and causes the generated subpicture header to be included in the coded data.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: August 30, 2022
    Assignees: SHARP KABUSHIKI KAISHA, FG Innovation Company Limited
    Inventors: Tomoko Aono, Takeshi Chujoh, Tomohiro Ikai, Yukinobu Yasugi
  • Publication number: 20220264142
    Abstract: An image decoding apparatus is provided that selectively uses a merge mode in a case that an MMVD mode is not available, thus achieving high coding efficiency. The image decoding apparatus includes a parameter decoder, and in a case that a regular merge flag indicates a regular merge mode, checks a flag indicating whether an MMVD prediction signalled in a sequence parameter set or the like is available, and in a case that the MMVD prediction is not available, decodes motion vector information obtained from a merge candidate.
    Type: Application
    Filed: July 21, 2020
    Publication date: August 18, 2022
    Inventors: Tomonori HASHIMOTO, Eiichi SASAKI, Tomohiro IKAI, Tomoko AONO
  • Patent number: 11412243
    Abstract: An image decoding apparatus is implemented that can suppress a decrease in coding efficiency in a case that a high compression rate is achieved. The image decoding apparatus includes a parameter decoder, and the parameter decoder decodes a skip flag indicating whether a skip mode is applied, and in a case that the skip flag does not indicate the skip mode, decodes a merge flag indicating whether a merge mode is applied, and in a case that the merge flag does not indicate the merge mode, decodes an MMVD flag indicating whether an MMVD mode is applied.
    Type: Grant
    Filed: December 3, 2019
    Date of Patent: August 9, 2022
    Assignees: SHARP KABUSHIKI KAISHA, FG INNOVATION COMPANY LIMITED
    Inventors: Takeshi Chujoh, Eiichi Sasaki, Tomonori Hashimoto, Tomoko Aono, Tomohiro Ikai
  • Patent number: 11399177
    Abstract: An image decoding apparatus (31) includes a CT information decoding unit (10) configured, in each coding tree, to decode a constraint flag indicating whether or not to constrain decoding a prediction unit, and a CU decoding unit (20) configured, in the coding tree, to decode a prediction unit in a coding node to be decoded first and to not decode a prediction unit in another coding node, in a case that the constraint flag indicates constraint of decoding the prediction unit. According to the present invention, it is possible to reduce a coding amount of PU and complexity of coding/decoding an image while maintaining a split with a high degree of freedom by CT split (QT split and BT split).
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: July 26, 2022
    Assignees: SHARP KABUSHIKI KAISHA, FG Innovation Company Limited
    Inventors: Tomohiro Ikai, Tomoko Aono
  • Publication number: 20220224942
    Abstract: An image decoding apparatus including a header decoder configured to decode, from coded data, a flag indicating whether dependent quantization is enabled and a flag prohibiting transform skip residual quantization, and a TU decoder configured to decode a transform coefficient in a TU block in an RRC mode in which a LAST position is coded, the LAST position corresponding to a decoding start position for the transform coefficient, or a TSRC mode in which the LAST position is not coded. The TU decoder performs dependent quantization in the RRC mode in a case that the transform coefficient for transform skip is decoded in the TSRC mode, and does not perform dependent quantization in the RRC mode in a case that the transform coefficient for transform skip is decoded in the RRC mode.
    Type: Application
    Filed: March 31, 2022
    Publication date: July 14, 2022
    Inventors: TOMONORI HASHIMOTO, EIICHI SASAKI, TOMOHIRO IKAI, TOMOKO AONO
  • Publication number: 20220182631
    Abstract: Provided is a video decoding apparatus for decoding coded data of a tile group in which a picture is split into rectangular regions, the tile group being composed of segments, the video decoding apparatus including: a header decoder configured to decode the number of tiles, a WPP enabled flag, and a slice enabled flag indicating whether segments in a target tile group are rectangular tiles, CTU rows, or slices from a tile group header, wherein the header decoder is configured to decode only one of the number of tiles being two or more, the WPP enabled flag being 1, and the slice enabled flag being 1 in one tile group.
    Type: Application
    Filed: February 7, 2020
    Publication date: June 9, 2022
    Inventors: Tomohiro IKAI, Tomoko AONO, Takeshi CHUJOH, Yukinobu YASUGI, Eiichi SASAKI
  • Publication number: 20220182660
    Abstract: An apparatus includes an inter prediction unit configured to decode multiple reference picture list structures and to select one reference picture list structure from the multiple reference picture list structures on a per picture basis or on a per slice basis, wherein in the multiple reference picture list structures, the number of all reference pictures is one or more.
    Type: Application
    Filed: February 25, 2022
    Publication date: June 9, 2022
    Inventors: TAKESHI CHUJOH, TOMOHIRO IKAI, TOMOKO AONO, EIICHI SASAKI, TOMONORI HASHIMOTO, TIANYANG ZHOU, YUKINOBU YASUGI
  • Publication number: 20220167002
    Abstract: An image decoding apparatus and an image coding apparatus that reduce complexity of high image quality processing are implemented. The image decoding apparatus includes an inter prediction parameter decoding processing unit that includes processing of, regarding two motion vectors, modifying the two motion vectors from an error of two prediction images. In a case that neither of the two prediction images is a case of weighted prediction, the processing of modifying the two motion vectors is performed.
    Type: Application
    Filed: March 6, 2020
    Publication date: May 26, 2022
    Inventors: Takeshi CHUJOH, Tomoko AONO, Tomohiro IKAI, Eiichi SASAKI, Yukinobu YASUGI
  • Patent number: 11336917
    Abstract: An image decoding apparatus including a header decoder configured to decode, from coded data, a flag indicating whether dependent quantization is enabled and a flag prohibiting transform skip residual quantization, and a TU decoder configured to decode a transform coefficient in a TU block in an RRC mode in which a LAST position is coded, the LAST position corresponding to a decoding start position for the transform coefficient, or a TSRC mode in which the LAST position is not coded. The TU decoder performs dependent quantization in the RRC mode in a case that the transform coefficient for transform skip is decoded in the TSRC mode, and does not perform dependent quantization in the RRC mode in a case that the transform coefficient for transform skip is decoded in the RRC mode.
    Type: Grant
    Filed: February 18, 2021
    Date of Patent: May 17, 2022
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomonori Hashimoto, Eiichi Sasaki, Tomohiro Ikai, Tomoko Aono
  • Patent number: 11303927
    Abstract: An apparatus includes an inter prediction unit configured to decode multiple reference picture list structures and to select one reference picture list structure from the multiple reference picture list structures on a per picture basis or on a per slice basis, wherein in the multiple reference picture list structures, the number of all reference pictures is one or more.
    Type: Grant
    Filed: March 15, 2021
    Date of Patent: April 12, 2022
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Takeshi Chujoh, Tomohiro Ikai, Tomoko Aono, Eiichi Sasaki, Tomonori Hashimoto, Tianyang Zhou, Yukinobu Yasugi
  • Publication number: 20220103853
    Abstract: A prediction image generation method using two prediction images to generate a prediction image by a device is provided. First and second prediction image are generated. Bidirectional prediction gradient change prediction processing is performed by using a first shift value and difference values of the first and second prediction images respectively in horizontal and vertical directions to generate a first, second, third and fourth gradient images. Motion information is derived by using the first and second prediction images, the first, second, third and fourth gradient images, a second shift value, and a third shift value. Motion compensation correction value is derived by using the motion information and the first, second, third and the fourth gradient images. The prediction image is generated by using the first and second prediction images and the motion compensation correction value. The first, second and third shift values are respectively equal to 6, 4 and 1.
    Type: Application
    Filed: December 11, 2019
    Publication date: March 31, 2022
    Inventors: TAKESHI CHUJOH, TOMONORI HASHIMOTO, TOMOKO AONO, TOMOHIRO IKAI
  • Publication number: 20220094973
    Abstract: A load in processing of searching for a motion vector is reduced. In order to solve the problem described above, a motion vector derivation apparatus according to one aspect of the present invention that derives a motion vector to be referred to for generating a prediction image to be used for coding or decoding of a video includes a motion vector search unit configured to search for a motion vector on a prediction unit basis through matching processing. The motion vector search unit is configured to stop search of the motion vector, depending on whether or not a conditional expression according to a pixel bit-depth is satisfied.
    Type: Application
    Filed: December 8, 2021
    Publication date: March 24, 2022
    Inventors: Takeshi CHUJOH, Tomoko AONO, Tomohiro IKAI, Eiichi SASAKI, Yukinobu YASUGI
  • Publication number: 20220094985
    Abstract: An image decoding device (31) includes a transform coefficient decoding unit (311) configured to decode a transform coefficient for a transform tree included in a coding unit. In the transform tree, the transform coefficient decoding unit splits a transform unit corresponding to luminance and then decodes the transform coefficient related to the luminance, and does not split the transform unit corresponding to chrominance and decodes the transform coefficient related to the chrominance.
    Type: Application
    Filed: November 8, 2021
    Publication date: March 24, 2022
    Inventors: Tomohiro IKAI, Tomoko AONO, Yukinobu YASUGI, Tomonori HASHIMOTO
  • Publication number: 20220078431
    Abstract: NPL 2 describes prediction (BIO prediction) using BIO processing in which in a case that a prediction image is derived, a gradient image is utilized to achieve high image quality, and this prediction involves an assumption that pixel values are temporally constant. Thus, there is a problem in that a fade image in which a pixel value has a temporal variation or the like is not successfully processed. A bi-directional optical flow sample prediction process unit that generates a prediction image using a gradient image derived from two interpolation images derives interpolation images for determining an optical flow by using a weight coefficient and an offset coefficient decoded from coded data for weighted bi-prediction, and generates a prediction image.
    Type: Application
    Filed: December 20, 2019
    Publication date: March 10, 2022
    Inventors: Takeshi CHUJOH, Tomonori HASHIMOTO, Tomoko AONO, Tomohiro IKAI, Eiichi SASAKI